Exploring Circularly Polarized Luminescence from Chiral Lanthanide Complexes

Circularly polarized luminescence (CPL) has emerged as a captivating area of exploration in materials chemistry and physics, offering diverse applications in both biological and technological realms. This thesis delves into the intriguing intersection of CPL and lanthanide complexes, specifically focusing on their unique chiroptical properties arising from electric‑dipole‑forbidden, magnetic‑dipole‑allowed f‒f transitions. In the pursuit of harnessing the full potential of lanthanide complexes, we explore their chiroptical prowess in the NIR region, a terrain uncharted. While limited reports exist, particularly for Yb in the 900‒1040 nm range, our research uncovers rare instances of NIR chiroptical properties in lanthanide complexes at lower energies. To experimentally quantify and characterize these unique features, we developed a straightforward yet effective, inexpensive setup. The results revealed remarkably strong CPL in complexes emitting between 1400‒1600 nm. In tandem with the investigation into NIR‑emitting complexes, we explored the realm of complexes showing CPL upon two‑photon excitation around 700 nm. Again, this exotic process has substantial implications for applications in bioassays and confocal microscopy, yet there are still few reports, mainly due to the complex instrumental setup and the limited number of suitable two‑photon excitable CPL dyes.